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Conference on Optoelectronic Materials and Devices for Optical Communications

作者： Li, JS Zhejiang Univ Ctr Opt & Electromagnet Res State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

ISBN: (纸本)0819460516

In this letter, we propose a novel optical modulator based on GaAs photonic crystals and investigate its optically properties numerically by using the finite-difference time-domain method. The position of the cutoff frequency can be varied by free carriers injection, and the band gap shift can be observed. Band gap shift is used to modulate light. Bing several micrometers length, low insertion loss, and large extinction ratios, the modulator can be used in ultra-small and ultra-dense photonic integrated circuits.

关键词： modulator photonic crystals optimum design optic-electron integrated bandwidth carrier injection finite-difference time-domain method GaAs design fabrication

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An ADI-FDTD algorithm in curvilinear coordinates

An ADI-FDTD algorithm in curvilinear coordinates

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Asia-Pacific Microwave Conference

作者： Song, W. Hao, Y. Parini, C. G. Queen Mary Univ London Dept Elect Engn London E1 4NS England

ISBN: (纸本)078039433X

The alternating direction implicit scheme (ADI) has been successfully applied to finite-difference time-domain (FDTD) method to achieve an unconditionally stable algorithm. In this paper the ADI-FDTD method is extended to a conformal FDTD scheme in curvilinear coordinates. The effectiveness and accuracy of the proposed ADI-NFDTD is demonstrated.

关键词： computational electromagnetics electromagnetic waves finite difference time-domain analysis iterative methods ADI-FDTD algorithm alternating direction implicit scheme curvilinear coordinates finite-difference time-domain method finite difference time domain method Spherical coordinates Computational electromagnetics electromagnetic waves iterative methods

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FDTD analysis of nano-antenna structures with dispersive materials at optical frequencies

FDTD analysis of nano-antenna structures with dispersive mat...

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Conference on Nanotechnology II

作者： Rico-García, JM López-Alonso, JM Alda, J Univ Complutense Madrid Sch Opt Madrid 28037 Spain

ISBN: (纸本)0819458333

The finite-difference time domain method has encountered several difficulties when analyzing dispersive materials. This is the case of the metal structures that configure an optical antenna. These devices couple the electromagnetic radiation to conform currents that are rectified by another physical element attached to the antenna. Both elements: antenna and rectifier configures an optical detector with sub-wavelength dimensions. In this contribution we analyze the effect on the currents induced by the incident electromagnetic field using FDTD and taking into account the dispersive character of metal at optical frequencies. The analysis is done in a 2 dimensional framework and it serves as an analytical tool for the election of material and structures in the fabrication of optical antennas.

关键词： Metals Antennas finite-difference time-domain method Visible radiation Dielectrics Dielectric polarization Maxwell's equations Optical antennas Refraction Electromagnetic radiation

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Two-dimensional photonic crystal polarization splitter

Two-dimensional photonic crystal polarization splitter

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Conference on Nanophotonics, Nanostructure and Nanometrology

作者： Li, MY Gu, PF Jie, X Li, YY Zhejiang Univ State Key Lab Modern Opt Instrumentat Hangzhou 310027 Peoples R China

ISBN: (纸本)0819455903

A method is introduced to fabricate two-dimensional photonic crystal polarization splitter, which is based on the deposition of multiplayer films onto a grating. The plane-wave expansion method and the finite-difference time-domain method are used to calculate the band structure of this two-dimensional photonic crystal formed by a rectangular lattice of rectangular columns. After optimizing the thickness of each layer film, we find a large bandgap of TE. The theoretical relative bandwidth is 33.2%.

关键词： photonic crystal polarization splitter bandgap finite-difference time-domain method

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High-Q microcavities realized in a circular photonic crystal slab

High-Q microcavities realized in a circular photonic crystal...

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6th International Symposium on Photonic and Electromagnetic Crystal Structures (PECS-VI)

作者： Xiao, SS Qiu, M Royal Inst Technol Dept Microelect & Informat Technol Lab Opt Photon & Quantum Elect S-16440 Stockholm Sweden

A series of microcavities in circular photonic crystal slabs are studied in this paper. It is shown that high quality factors can be obtained for such microcavities. For a cavity with three inner layers of air holes missing, Q factor larger than 105 can be obtained. It is also worth noting there exists resonant modes with high quality factors, even for the defect-free circular photonic crystal slab, due to gradual change of the average effective index. (c) 2005 Elsevier B.V. All rights reserved.

关键词： microcavity photonic crystal finite-difference time-domain method

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Surface plasmon polariton propagation around bends at a metal-dielectric interface

Surface plasmon polariton propagation around bends at a meta...

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Conference on Integrated Optics - Devices, Materials and Technologies IX

作者： Deustch, M Hasegawa, K Nöckel, JU Univ Oregon Dept Phys Eugene OR 97103 USA

ISBN: (纸本)0819457027

We present an analytical study of surface plasmon polariton (SPP) propagation about a circular bend formed by the interface between a metal and a dielectric with the metal occupying the inner volume. It is shown that in the short wavelength limit, the problem is essentially analogous to scattering from a ID finite potential well, with standard expressions for the transmittance and reflectance. In certain cases, we find that propagation on nonplanar interfaces may result in lower losses than on flat surfaces, contrary to expectation. We also show that the same approach is valid when the metal occupies the outer volume, such that in the ID approximation SPPs propagating around such bends do not radiate. An upper bound for the transmittance, valid even when our approximation breaks down, is also derived. This is found to depend nonmonotonically on the bend radius, allowing increased transmission with decreasing radius. We further present a numerical study using the finite-difference time-domain method and show that it is consistent with theoretical predictions. We also show that the introduction of a microcavity plasmon resonator could significantly enhance the transmission.

关键词： surface plasmon polariton waveguide bend loss mode matching finite-difference time-domain method microcavity

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Far-field optical response of localized near-field enhancements induced by nano scatters in AgO_x super-resolution near-field structure

Far-field optical response of localized near-field enhanceme...

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Conference on Advances in Optical Data Storage Technology

作者： Chu, TC Liu, WC Tsai, DP Natl Taiwan Univ Ctr Nanostorage Res Taipei 10617 Taiwan

ISBN: (纸本)0819455989

The super-resolution near-field structure (super-RENS) is an ultrahigh-density near-field optical disk data storage medium which can achieve superior spatial resolution. Our previous studies found that enhanced local optical intensity occurred at the near field of the super-RENS disk, and the nonlinear near-field optical enhancement is related to the localized surface plasmons of silver clusters dissociated from the AgOx layer of the super-RENS disk. In this paper, we report the near-field and far-field properties of AgOx-type super-RENS with different embedded silver nanoparticles using two-dimensional finite-difference time-domain (FDTD) calculations. Highly localized enhancements are found between adjacent silver nanoparticles in the near fields. The far-field signals of different types silver nano scatters confirm the super-resolution capability of AgOx-type Super-RENS disks. The behaviors of far-field signals indicate the correlation between the enhanced localized surface plasmons and the super-resolution capabilities of AgOx-type super-RENS.

关键词： localized surface plasmon super-resolution near-field structure near-field optical storage optical disks finite-difference time-domain method metallic nanoparticles

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Compact single air interface bends in PFCB polymer waveguides

Compact single air interface bends in PFCB polymer waveguide...

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Conference on Integrated Optics - Devices, Materials and Technologies IX

作者： Cardenas, J Kim, S Cai, J Nordin, GP Univ Alabama Nano & Micro Devices Ctr Huntsville AL 35899 USA

ISBN: (纸本)0819457027

Compact waveguide bends and splitters are important components to enable dense integration of many functions on a single photonic chip. A common approach is to use a waveguide material system in which a large refractive index contrast between the core and clad materials is available. This permits a small bend radius to be used while still achieving high optical efficiency for the bend. However, such material systems generally have higher propagation loss than is possible with low refractive index contrast material systems such as silica. In this presentation we examine an approach to make the bend size essentially independent of the core/clad refractive index contrast using total internal reflection from a planar interface. We show through both 2D and 3D finite difference time domain (FDTD) simulation that very high bend efficiencies are possible when the correct bend design principles are adhered to. We illustrate this in practice with single air interface bends (SAIBs) in a PFCB material system with approximately 1% refractive index contrast. We experimentally demonstrate 45 degree bends with 0.3 dB loss per bend, and discuss the effects of fabrication issues such as misalignment, etch undercut, and etch roughness.

关键词： Waveguides Interfaces Refractive index Etching finite-difference time-domain method Polymers Waveguide modes Polymer multimode waveguides Wave propagation Photonic crystals

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Causal parameter extractions by vector fitting for use in time-domain numerical modeling

Causal parameter extractions by vector fitting for use in ti...

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2005 IEEE Antennas and Propagation Society International Symposium and USNC/URSI Meeting

作者： Shuiping, Luo Zhizhang, Chen Department of Electrical and Computer Engineering Dalhousie University Halifax NS B3J 2X4 Canada

No abstract available

ISBN: (纸本)0780388836

No abstract available

关键词： approximation theory convolution lumped parameter networks network parameters semiconductor device models time-domain analysis CPU time saving factor causal parameter extraction coefficient extraction technique finite-difference time-domain method freque

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Design tips of nanoapertures with strong field enhancement and proposal of novel L-shaped aperture

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OPTICAL ENGINEERING 2005年第1期44卷 9-9页

作者： Xu, JY Xu, TJ Wang, J Tian, Q Tsinghua Univ State Key Lab Precis Measurement Technol & Instru Dept Precis Instruments Beijing 100084 Peoples R China

We summarize some design tips and design procedures of nanoapertures with strong field enhancement, based on the theoretical calculations and analyses of near-field distributions of unconventional C apertures and bow-tie apertures by a finite-difference time-domain method. A novel L-shaped aperture is proposed and further validates the proposed design rule. As a result, a 15x15-nm full width half maximum spot forms in the light exit plane of the L aperture. Its intensity maximum enhancement reaches a factor of about 568 and the power throughput is bigger than unity. The mechanisms of electromagnetic field enhancement are preliminarily analyzed. This unconventional nanoaperture is likely to be directly used as an exit aperture of very small aperture lasers, or as an unattached shield, to produce a subwavelength light source with high transmission. (C) 2005 Society of Photo-Optical Instrumentation Engineers.

关键词： near-field optics nanoaperture field enhancement finite-difference time-domain method

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